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Drum Lenses

A Drum Lens is a variation of a ball lens where a portion of the ball is ground down to a smaller diameter.

These lenses are used in similar applications to those of ball lenses.

The Drum Lens adds the ability to handle and package it in a different way.

●Cylindrical Sides with Convex curvatures
●Typical Ball lens Performance
●High Transmittance
●Low Reflectance
●Accurate Wavelength manipulation

●Compact Fiberoptical Components
●Laser Systems
●Micro Optical Devices
●Optical Assemblies

Material BK7 grade A, B270, UV grade Fused Silica, Sapphire etc.
Diameter (φ) Tolerance +0/-0.05mm (Standard), up to +0.000/-0.002mm
Length (L) Tolerance ±0.05mm (Standard), up to +0/-0.002um
Surface Quality 60-40 S/D (Standard), up to 20-10 S/D
Coating none
BK7 Drum Lens Standard Products:
Part No. φ(mm) L(mm)
2.0 2.5
2.0 3.0
3.0 4.0
4.0 5.0


Coatings and other materials are available upon request.

Sapphire Dome, Jewel Ball, Ruby Ball and Jewel Blind Holed Ball etc are also available upon request.

ATE-DENMARK is an OEM manufacturer, and we don´t have much standard products in stock.

So please contact us for your custom optics.